C233 水素・空気乱流予混合火炎の局所構造に対するレイノルズ数の影響(C-23 燃焼流(2),一般講演)

概要

論文の詳細を見る
Three-dimensional direct numerical simulations of hydrogen/air turbulent premixed flames are conducted with a detailed kinetic mechanism. Comparison of DNS results with different Reynolds numbers shows that the three-dimensional flame structures such as the handgrip and spire structure are important in determining the total heat release rate of high Reynolds number up to Re_λ=97.1 turbulent premixed flames. To investigate relation between three-dimensional flame shape and local heat release rate, a proper flame surface representation is introduced. Flame shape in turbulence are classified into spherical surface convex toward the burned side (S-B), cylindrical surface convex toward the burned side (C-B), hyperboloidal surface (HB), cylindrical surface convex toward the unburned side (C-U) and spherical surface convex toward the unburned side (S-U). It is shown that contribution of S-B and C-B flame elements increases in high Reynolds number turbulent flames and dominates the total heat release rate and turbulent burning velocity.
日本流体力学会の論文
2004-08-09